SMTP authentication problem

Question

I try to send mail with a Javamail client code (you can see the code below), it works fine if the mail server doesn't require SMTP authentication to be relay, but SendFailedException occurs if the mail server security setting is set to SMTP requires authentication (same settings as POP usr/pwd) on the mail server.
I believe it is an issue of SMTP authentication.
How do I code for SMTP authentication with Java Mail API?
Thanks!
Can Odabasioglu
Source Code:
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
import java.io.UnsupportedEncodingException;
public class MailExample {
public static void main (String args[]) {
String host = "odabasioglu.net";
String from = "[email protected]";
String to = "[email protected]";
     try {
     Properties props = System.getProperties();
     Authenticator auth = new POPAuth ();
     props.put("mail.smtp.host", host);
     Session session = Session.getInstance(props, auth);
     MimeMessage message = new MimeMessage(session);
     message.setFrom(new InternetAddress(from,"FromName"));
     message.addRecipient(Message.RecipientType.TO,new InternetAddress(to,"ToName"));
     message.setSubject("Test Subject");
     message.setText("Can Odabasioglu");
     Transport.send(message);
     catch (MessagingException e) {e.toString();}
catch (UnsupportedEncodingException e) {e.toString();}
static class POPAuth extends Authenticator {
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("UserName", "Password");
}

Answer 1

“Cannot send message using the server
Mail.ISP.net:[email protected]”
…And provides the “Send message using:” pulldown to
select one of two accounts (one is followed by
“:[email protected]”, the other is not). Both are the
same options the other two machines have, but neither
option works on this machine.
This is one of those error messages that they send application programmers to school for so that they can include error messages that don't tell you what the problem is.
After much trial and error, I discovered that this message is returned if there is an error in the recipient's email address. Perhaps, if it was stored in the address book, it became corrupt. I've found that manually typing in the address (without automatically finishing it from cache) usually fixes the problem. I just spoke to a customer this morning with the same error message, and entering the recipient's email address manually corrected the problem.